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| author | Al Viro <viro@zeniv.linux.org.uk> | 2013-11-06 09:54:52 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2013-11-09 00:16:31 -0500 |
| commit | 5a3cd99285dc793a4022fa75ceeb323eb6d29ac9 (patch) | |
| tree | 84d6be981f67655016a62febd87f89bec53c89b3 | |
| parent | b18825a7c8e37a7cf6abb97a12a6ad71af160de7 (diff) | |
| download | lwn-5a3cd99285dc793a4022fa75ceeb323eb6d29ac9.tar.gz lwn-5a3cd99285dc793a4022fa75ceeb323eb6d29ac9.zip | |
iget/iget5: don't bother with ->i_lock until we find a match
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | Documentation/filesystems/porting | 8 | ||||
| -rw-r--r-- | drivers/staging/lustre/lustre/llite/namei.c | 2 | ||||
| -rw-r--r-- | fs/inode.c | 20 | ||||
| -rw-r--r-- | fs/ntfs/inode.c | 2 |
4 files changed, 16 insertions, 16 deletions
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting index f0890581f7f6..fe2b7ae6f962 100644 --- a/Documentation/filesystems/porting +++ b/Documentation/filesystems/porting @@ -455,3 +455,11 @@ in your dentry operations instead. vfs_follow_link has been removed. Filesystems must use nd_set_link from ->follow_link for normal symlinks, or nd_jump_link for magic /proc/<pid> style links. +-- +[mandatory] + iget5_locked()/ilookup5()/ilookup5_nowait() test() callback used to be + called with both ->i_lock and inode_hash_lock held; the former is *not* + taken anymore, so verify that your callbacks do not rely on it (none + of the in-tree instances did). inode_hash_lock is still held, + of course, so they are still serialized wrt removal from inode hash, + as well as wrt set() callback of iget5_locked(). diff --git a/drivers/staging/lustre/lustre/llite/namei.c b/drivers/staging/lustre/lustre/llite/namei.c index 34815b550e71..90bbdae824ac 100644 --- a/drivers/staging/lustre/lustre/llite/namei.c +++ b/drivers/staging/lustre/lustre/llite/namei.c @@ -83,7 +83,7 @@ int ll_unlock(__u32 mode, struct lustre_handle *lockh) } -/* called from iget5_locked->find_inode() under inode_lock spinlock */ +/* called from iget5_locked->find_inode() under inode_hash_lock spinlock */ static int ll_test_inode(struct inode *inode, void *opaque) { struct ll_inode_info *lli = ll_i2info(inode); diff --git a/fs/inode.c b/fs/inode.c index b33ba8e021cc..bf7a8b3ab937 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -773,15 +773,11 @@ static struct inode *find_inode(struct super_block *sb, repeat: hlist_for_each_entry(inode, head, i_hash) { - spin_lock(&inode->i_lock); - if (inode->i_sb != sb) { - spin_unlock(&inode->i_lock); + if (inode->i_sb != sb) continue; - } - if (!test(inode, data)) { - spin_unlock(&inode->i_lock); + if (!test(inode, data)) continue; - } + spin_lock(&inode->i_lock); if (inode->i_state & (I_FREEING|I_WILL_FREE)) { __wait_on_freeing_inode(inode); goto repeat; @@ -804,15 +800,11 @@ static struct inode *find_inode_fast(struct super_block *sb, repeat: hlist_for_each_entry(inode, head, i_hash) { - spin_lock(&inode->i_lock); - if (inode->i_ino != ino) { - spin_unlock(&inode->i_lock); + if (inode->i_ino != ino) continue; - } - if (inode->i_sb != sb) { - spin_unlock(&inode->i_lock); + if (inode->i_sb != sb) continue; - } + spin_lock(&inode->i_lock); if (inode->i_state & (I_FREEING|I_WILL_FREE)) { __wait_on_freeing_inode(inode); goto repeat; diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c index 2778b0255dc6..ffb9b3675736 100644 --- a/fs/ntfs/inode.c +++ b/fs/ntfs/inode.c @@ -55,7 +55,7 @@ * * Return 1 if the attributes match and 0 if not. * - * NOTE: This function runs with the inode->i_lock spin lock held so it is not + * NOTE: This function runs with the inode_hash_lock spin lock held so it is not * allowed to sleep. */ int ntfs_test_inode(struct inode *vi, ntfs_attr *na) |